<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="jquery-1.8.2.min.js"></script>
    <style>
        textarea {
            height: 35px;
        }
        div {
            color: red;
        }
        fieldset {
            margin: 0;
            padding: 0;
            border-width: 0;
        }
        .marked {
            background-color: yellow;
            border: 3px solid red;
        }
    </style>
</head>
<body>
    <form>
        <!-- ---------------------------第一种--------------------------- -->
        <!--<fieldset>
            <input type="button" value="input Button"/>
            <input type="checkbox"/>
            <input type="file">
            <input type="hidden">
            <input type="image">
            <input type="radio">
            <input type="reset">
            <input type="submit">
            <input type="text">
            <input type="submit">
            <select><option>Option</option></select>
            <textarea></textarea>
            <button>Botton</button>
        </fieldset>-->

        <!-- ---------------------------第二种--------------------------- -->
        <input name="email" disabled="disabled"/>
        <input name="id"/>
    </form>
    <div></div>
</body>
<script>
    $(function () {
        // ---------------------------第一种---------------------------
        // var input = $(":button").addClass("marked");
        // var input = $(":input").addClass("marked");

        // ---------------------------第二种---------------------------
        $("input:disabled").val("haha")
    })
</script>
</html>